Shendu and Xi Aili are all trade names, and their generic name is tadalafil, there is no accurate conclusion on the comparison of the efficacy of the two, and the specific use of the drug should be in accordance with the doctor’s instructions. These two drugs are products of different manufacturers of tadalafil tablets, but they belong to the same kind of drug, and both are suitable for the treatment of erectile dysfunction in men over 18 years old. There is a lack of authoritative studies comparing the efficacy of these two medications, and the specific efficacy of the medications may vary depending on the individual’s physical condition and other factors, so it is not possible to say which one is better. In addition, it should be noted that tadalafil tablets are prohibited for people who are allergic to it, and also prohibited with nitroglycerin, nitrate isosorbide and other nitrate drugs, headache, flushing and other adverse reactions may occur in the process of using the drug. To sum up, tadalafil tablets need to be used under the guidance of a doctor to choose and standardize the use of drugs, do not blindly use drugs or increase or decrease the amount of drugs, so as not to cause adverse consequences.